520 Rib Advise

[Locozodiac]

Hello Ribsters

Old sib user but new to rib world, will need your expertise on these tech issues :

1-If planning to install a skier U ring on transom to place ski rope which side would be ideal to install : left or right as seen from rear transom, engine is a 60 HP counter rotating engine/prop. A ski pole placed on middle rib transom will not be used.

2-To get best skier/hole shot performance :
-Stay with medium pitch prop factory delivered
-Perform WOT test, go for max engine rpm allowed and change prop to match wot.
-Ideal crew : skier, driver, copilot in bow or just 2, skier & driver ?

3-Rib configuration :
Central console/ 520 with 60 HP, 2 strokes, 20” tail
max engine permitted 75/80 HP (2 strokes) so 15/20 HP less top engine.
What comes immediately after a Yam 60 HP (2T) model ?

4-Gasoline Tanks:
Which is better, 6 gallons on central console or 15 gallons internal tank, probably at transom or under central console (data is not available at this moment) which combination tank type/ski crew will balance rib properly ?

Short answers will be highly appreciated.

Happy Ribbing

[Polwart]

Originally Posted by Locozodiac

1-If planning to install a skier U ring on transom to place ski rope which side would be ideal to install : left or right as seen from rear transom, engine is a 60 HP counter rotating engine/prop. A ski pole placed on middle rib transom will not be used.

I think it is normal to fit both and use a "bridle" between them to "centralise" the pull.

[hadd]

hi mate , put a u ski ring on both sides of transom then the rope won,t catch the engine when turning

[jyasaki]

Originally Posted by Locozodiac

2-To get best skier/hole shot performance :
-Stay with medium pitch prop factory delivered
-Perform WOT test, go for max engine rpm allowed and change prop to match wot.
-Ideal crew : skier, driver, copilot in bow or just 2, skier & driver ?

A 4-blade prop selected for WOT rpm would give you a better hole shot than a 3 blade, at the expense of a bit of top end speed. Selecting for a slightly higher than recommended rpm will give a better still hole shot, but you'll have to be careful about running WOT with no load.

In the US, you'd be illegal running with just a skier and a driver. Requirement is driver, spotter, skier. Don't know about Peru.



jky